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-rw-r--r--net/rxrpc/krxiod.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/net/rxrpc/krxiod.c b/net/rxrpc/krxiod.c
new file mode 100644
index 00000000000..2b537f425a1
--- /dev/null
+++ b/net/rxrpc/krxiod.c
@@ -0,0 +1,261 @@
+/* krxiod.c: Rx I/O daemon
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <rxrpc/krxiod.h>
+#include <rxrpc/transport.h>
+#include <rxrpc/peer.h>
+#include <rxrpc/call.h>
+#include "internal.h"
+
+static DECLARE_WAIT_QUEUE_HEAD(rxrpc_krxiod_sleepq);
+static DECLARE_COMPLETION(rxrpc_krxiod_dead);
+
+static atomic_t rxrpc_krxiod_qcount = ATOMIC_INIT(0);
+
+static LIST_HEAD(rxrpc_krxiod_transportq);
+static DEFINE_SPINLOCK(rxrpc_krxiod_transportq_lock);
+
+static LIST_HEAD(rxrpc_krxiod_callq);
+static DEFINE_SPINLOCK(rxrpc_krxiod_callq_lock);
+
+static volatile int rxrpc_krxiod_die;
+
+/*****************************************************************************/
+/*
+ * Rx I/O daemon
+ */
+static int rxrpc_krxiod(void *arg)
+{
+ DECLARE_WAITQUEUE(krxiod,current);
+
+ printk("Started krxiod %d\n",current->pid);
+
+ daemonize("krxiod");
+
+ /* loop around waiting for work to do */
+ do {
+ /* wait for work or to be told to exit */
+ _debug("### Begin Wait");
+ if (!atomic_read(&rxrpc_krxiod_qcount)) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ add_wait_queue(&rxrpc_krxiod_sleepq, &krxiod);
+
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (atomic_read(&rxrpc_krxiod_qcount) ||
+ rxrpc_krxiod_die ||
+ signal_pending(current))
+ break;
+
+ schedule();
+ }
+
+ remove_wait_queue(&rxrpc_krxiod_sleepq, &krxiod);
+ set_current_state(TASK_RUNNING);
+ }
+ _debug("### End Wait");
+
+ /* do work if been given some to do */
+ _debug("### Begin Work");
+
+ /* see if there's a transport in need of attention */
+ if (!list_empty(&rxrpc_krxiod_transportq)) {
+ struct rxrpc_transport *trans = NULL;
+
+ spin_lock_irq(&rxrpc_krxiod_transportq_lock);
+
+ if (!list_empty(&rxrpc_krxiod_transportq)) {
+ trans = list_entry(
+ rxrpc_krxiod_transportq.next,
+ struct rxrpc_transport,
+ krxiodq_link);
+
+ list_del_init(&trans->krxiodq_link);
+ atomic_dec(&rxrpc_krxiod_qcount);
+
+ /* make sure it hasn't gone away and doesn't go
+ * away */
+ if (atomic_read(&trans->usage)>0)
+ rxrpc_get_transport(trans);
+ else
+ trans = NULL;
+ }
+
+ spin_unlock_irq(&rxrpc_krxiod_transportq_lock);
+
+ if (trans) {
+ rxrpc_trans_receive_packet(trans);
+ rxrpc_put_transport(trans);
+ }
+ }
+
+ /* see if there's a call in need of attention */
+ if (!list_empty(&rxrpc_krxiod_callq)) {
+ struct rxrpc_call *call = NULL;
+
+ spin_lock_irq(&rxrpc_krxiod_callq_lock);
+
+ if (!list_empty(&rxrpc_krxiod_callq)) {
+ call = list_entry(rxrpc_krxiod_callq.next,
+ struct rxrpc_call,
+ rcv_krxiodq_lk);
+ list_del_init(&call->rcv_krxiodq_lk);
+ atomic_dec(&rxrpc_krxiod_qcount);
+
+ /* make sure it hasn't gone away and doesn't go
+ * away */
+ if (atomic_read(&call->usage) > 0) {
+ _debug("@@@ KRXIOD"
+ " Begin Attend Call %p", call);
+ rxrpc_get_call(call);
+ }
+ else {
+ call = NULL;
+ }
+ }
+
+ spin_unlock_irq(&rxrpc_krxiod_callq_lock);
+
+ if (call) {
+ rxrpc_call_do_stuff(call);
+ rxrpc_put_call(call);
+ _debug("@@@ KRXIOD End Attend Call %p", call);
+ }
+ }
+
+ _debug("### End Work");
+
+ try_to_freeze(PF_FREEZE);
+
+ /* discard pending signals */
+ rxrpc_discard_my_signals();
+
+ } while (!rxrpc_krxiod_die);
+
+ /* and that's all */
+ complete_and_exit(&rxrpc_krxiod_dead, 0);
+
+} /* end rxrpc_krxiod() */
+
+/*****************************************************************************/
+/*
+ * start up a krxiod daemon
+ */
+int __init rxrpc_krxiod_init(void)
+{
+ return kernel_thread(rxrpc_krxiod, NULL, 0);
+
+} /* end rxrpc_krxiod_init() */
+
+/*****************************************************************************/
+/*
+ * kill the krxiod daemon and wait for it to complete
+ */
+void rxrpc_krxiod_kill(void)
+{
+ rxrpc_krxiod_die = 1;
+ wake_up_all(&rxrpc_krxiod_sleepq);
+ wait_for_completion(&rxrpc_krxiod_dead);
+
+} /* end rxrpc_krxiod_kill() */
+
+/*****************************************************************************/
+/*
+ * queue a transport for attention by krxiod
+ */
+void rxrpc_krxiod_queue_transport(struct rxrpc_transport *trans)
+{
+ unsigned long flags;
+
+ _enter("");
+
+ if (list_empty(&trans->krxiodq_link)) {
+ spin_lock_irqsave(&rxrpc_krxiod_transportq_lock, flags);
+
+ if (list_empty(&trans->krxiodq_link)) {
+ if (atomic_read(&trans->usage) > 0) {
+ list_add_tail(&trans->krxiodq_link,
+ &rxrpc_krxiod_transportq);
+ atomic_inc(&rxrpc_krxiod_qcount);
+ }
+ }
+
+ spin_unlock_irqrestore(&rxrpc_krxiod_transportq_lock, flags);
+ wake_up_all(&rxrpc_krxiod_sleepq);
+ }
+
+ _leave("");
+
+} /* end rxrpc_krxiod_queue_transport() */
+
+/*****************************************************************************/
+/*
+ * dequeue a transport from krxiod's attention queue
+ */
+void rxrpc_krxiod_dequeue_transport(struct rxrpc_transport *trans)
+{
+ unsigned long flags;
+
+ _enter("");
+
+ spin_lock_irqsave(&rxrpc_krxiod_transportq_lock, flags);
+ if (!list_empty(&trans->krxiodq_link)) {
+ list_del_init(&trans->krxiodq_link);
+ atomic_dec(&rxrpc_krxiod_qcount);
+ }
+ spin_unlock_irqrestore(&rxrpc_krxiod_transportq_lock, flags);
+
+ _leave("");
+
+} /* end rxrpc_krxiod_dequeue_transport() */
+
+/*****************************************************************************/
+/*
+ * queue a call for attention by krxiod
+ */
+void rxrpc_krxiod_queue_call(struct rxrpc_call *call)
+{
+ unsigned long flags;
+
+ if (list_empty(&call->rcv_krxiodq_lk)) {
+ spin_lock_irqsave(&rxrpc_krxiod_callq_lock, flags);
+ if (atomic_read(&call->usage) > 0) {
+ list_add_tail(&call->rcv_krxiodq_lk,
+ &rxrpc_krxiod_callq);
+ atomic_inc(&rxrpc_krxiod_qcount);
+ }
+ spin_unlock_irqrestore(&rxrpc_krxiod_callq_lock, flags);
+ }
+ wake_up_all(&rxrpc_krxiod_sleepq);
+
+} /* end rxrpc_krxiod_queue_call() */
+
+/*****************************************************************************/
+/*
+ * dequeue a call from krxiod's attention queue
+ */
+void rxrpc_krxiod_dequeue_call(struct rxrpc_call *call)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&rxrpc_krxiod_callq_lock, flags);
+ if (!list_empty(&call->rcv_krxiodq_lk)) {
+ list_del_init(&call->rcv_krxiodq_lk);
+ atomic_dec(&rxrpc_krxiod_qcount);
+ }
+ spin_unlock_irqrestore(&rxrpc_krxiod_callq_lock, flags);
+
+} /* end rxrpc_krxiod_dequeue_call() */
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